Folding Boxes: Sizes, Materials and What to Specify

Key Takeaways

  • A folding box ships flat as a creased blank and is erected at the packing bench, which is why it stores in a fraction of the space of a rigid box.
  • The style is chosen by how it closes: straight tuck and reverse tuck for hand packing, seal end for glued lines and tamper evidence, auto bottom for speed under weight.
  • Paperboard has a grain direction. Folds that run along the grain crease cleanly, while folds across it are more likely to crack, particularly through heavy ink or a laminate.
  • iBox makes folding boxes from a minimum of 100 boxes, from about $0.48 per unit at bulk volumes, with the die and plates included.

To order, go to folding boxes. This guide is about choosing a style and a board, which is where most of the cost and most of the practical problems live.

Choosing the style by how it closes

StyleHow it closesBest for
Straight tuck endBoth tuck flaps fold from the back panelA clean front face with no visible flap edge
Reverse tuck endFlaps fold from opposite panelsEfficient material use, the common economical choice
Seal endGlued closed after fillingAutomated filling and visible tamper evidence
Auto bottom or crash lockPre-glued base pops into shapeFast hand packing and heavier contents
Tuck top snap lock bottomBase folded by hand in sequenceModerate weight without the glued base cost

Details on the two base options are on what a crash lock base is, and on the top closure at what a tuck flap is.

Board grain, the thing nobody mentions

Paperboard fibres line up in one direction during manufacture, which gives the sheet a grain. A fold running along the grain creases smoothly. A fold running across it fights the fibres and is more likely to crack along the score, and that crack shows white through dark ink or a laminate. A good layout takes grain direction into account when it places the panels on the sheet, which is part of what design support is for on an iBox order. If you have seen cracking on a previous supplier's cartons, grain direction and the score rule are the first two things to look at.

Board grade and caliper

  • SBS. White through the thickness with the best print surface. The choice when the carton is the face of the product. See what SBS board is.
  • Coated recycled board. A recycled body with a coated white print face. The economical workhorse for retail cartons.
  • Kraft. Unbleached and brown, strong for its weight, with a deliberately natural look.
  • Caliper. Quoted in points, where one point is one thousandth of an inch. Heavier feels more substantial and costs more per unit, and beyond a point it stops creasing cleanly at small carton sizes.

Why folding boxes suit most brands

They ship flat, so freight and storage cost a fraction of an assembled rigid box. They erect quickly at the bench. They take print well across the whole surface. And because the cutting die is included on iBox orders, the structure can be cut to your product rather than to a near-enough stock size, which reduces void fill and improves how the product presents when the carton is opened.

What to send for a quote

Internal length x width x depth, marked as internal. The style you want, or a description of how it will be filled and by whom. The filled weight. The board and caliper if you know it, or a note asking for a recommendation. Artwork as vector files with fonts outlined, or a note that you need design support. That set is enough to quote accurately without a round of questions.

Ordering

Minimum order is 100 boxes. Pricing starts from about $0.48 per unit at bulk volumes and is confirmed on your written quote, with the die, the plates, design support, US shipping and a digital proof included. Three lanes are available: rush with expedited production and air freight, standard on air, and cost saver by sea, from about 7 business days, plus 2 to 5 for delivery. We produce at West Chicago and at Guangzhou.

Order from the folding boxes page, or send your dimensions and style through the quote form and we will return a dieline to check before anything is cut.

Get a Custom Quote

Free die and plates, free design support, free US shipping. Minimums from 100 boxes.